Sound machine



FIG. 1 is a front perspective view of a sound machine, showing the new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is an opposite side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the figures illustrate the portions of the sound machine and form no part of the claimed design. 

CLAIM The ornamental design for a sound machine, as shown and described. 